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/usr/share/osgearth/maps/splat-with-mask-layer.earth is in osgearth-data 2.9.0+dfsg-1.

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The actual contents of the file can be viewed below.

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<!--
|  Procedural trees with a mask layer.
|  The mask layer prevents the trees from drawing wherever there is geometry.
-->

<map>
    <options>
        <terrain driver="rex"/>
    </options>

    <libraries>osgEarthSplat</libraries>

    <xi:include href="/usr/share/osgearth/data/land_cover_dictionary.xml"/>

    <land_cover name="LandCover" max_data_level="15">
        <cache_policy usage="no_cache"/>
        <coverages>
            <coverage name="ESA GLOBCOVER" driver="gdal">
                <url>H:/data/esa/GLOBCOVER_L4_200901_200912_V2.3_Ant_tiled.tif</url>
                <profile>global-geodetic</profile>
                <xi:include href="/usr/share/osgearth/data/land_cover_ESA_GLOBCOVER.xml"/>
                <warp>0.05</warp>
            </coverage>
        </coverages>
    </land_cover>

    <elevation name="readymap_elevation" driver="tms" enabled="true">
        <url>http://readymap.org/readymap/tiles/1.0.0/116/</url>
    </elevation>

    <splat_imagery name="Splat Imagery" land_cover_layer="LandCover">
        <zones>
            <zone name="default">
                <surface>
                    <catalog>/usr/share/osgearth/data/splat/splat_catalog.xml</catalog>
                </surface>
            </zone>
        </zones>
    </splat_imagery>

    <splat_groundcover name="Trees" land_cover_layer="LandCover">
        <lod>13</lod>
        <cast_shadows>true</cast_shadows>
        <mask_layer>Boston Streets</mask_layer>
        <zones>
            <zone name="default">
                <groundcover>
                    <max_distance>10000</max_distance>
                    <density>4.0</density>
                    <fill>1.0</fill>
                    <brightness>3.0</brightness>
                    <contrast>1.0</contrast>
                    <biomes>
                        <biome classes="forest urban grassland cropland">
                            <billboard url="/usr/share/osgearth/data/splat/pine2.png" width="12.0" height="16.0"/>
                        </biome>
                    </biomes>
                </groundcover>
            </zone>
        </zones>
    </splat_groundcover>

    <!-- Setting shared="true" lets us use this as our mask layer -->
    <image name="Boston Streets" driver="agglite" shared="true" min_level="10" max_data_level="17">
        <warp>0</warp>
        <features driver="ogr" build_spatial_index="true">
            <url>/usr/share/osgearth/data/boston-scl-utm19n-meters.shp</url>
        </features>
        <styles>
            <style type="text/css">
                default {
                    stroke-width: 10m;
                    stroke-image: "/usr/share/osgearth/data/road.png";
                }
            </style>
        </styles>
        <cache_policy usage="no_cache"/>
    </image>

    <viewpoints>
        <viewpoint name="Tree-Covered Boston">
            <heading>9.95514</heading>
            <pitch>-19.0589</pitch>
            <range>3450.07m</range>
            <long>-71.06514757538032</long>
            <lat>42.35534282973394</lat>
            <height>14.42520617321134</height>
            <srs>+proj=longlat +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +no_defs </srs>
        </viewpoint>
    </viewpoints>

</map>